U.S. patent application number 15/370473 was filed with the patent office on 2017-03-23 for radial press.
The applicant listed for this patent is UNIFLEX HYDRAULIK GmbH. Invention is credited to Carsten BAUMGARTNER, Hubert POTH, Harald VON WAITZ.
Application Number | 20170080659 15/370473 |
Document ID | / |
Family ID | 52997395 |
Filed Date | 2017-03-23 |
United States Patent
Application |
20170080659 |
Kind Code |
A1 |
POTH; Hubert ; et
al. |
March 23, 2017 |
RADIAL PRESS
Abstract
A radial press is provided, the radial press having a frame
structure, a pressing tool, a drive unit, and a press control. The
pressing tool comprises a plurality of pressing elements which are
disposed uniformly concentrically around a press axis and have
pressing surfaces. During the appropriate activation of the drive
unit, the pressing elements can be moved synchronously as required
towards or away from the press axis. To this end, at least two
measured value recorders, which are connected for signal
transmission purposes to a comparator associated with the press
control, are disposed on the pressing tool at positions spaced
apart from one another in the direction of the press axis (A). When
the comparative value, generated by the comparator, of the measured
values provided by the measured value recorders exceeds a tolerance
range stored in the press control, an activation of the signal
output unit is triggered.
Inventors: |
POTH; Hubert; (Nidderau,
DE) ; VON WAITZ; Harald; (Kahl am Main, DE) ;
BAUMGARTNER; Carsten; (Laubach, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
UNIFLEX HYDRAULIK GmbH |
Karben |
|
DE |
|
|
Family ID: |
52997395 |
Appl. No.: |
15/370473 |
Filed: |
December 6, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/EP2015/000828 |
Apr 21, 2015 |
|
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15370473 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B30B 7/04 20130101; B21D
39/048 20130101; B25B 27/10 20130101; B30B 15/16 20130101 |
International
Class: |
B30B 7/04 20060101
B30B007/04; B25B 27/10 20060101 B25B027/10; B21D 39/04 20060101
B21D039/04; B30B 15/16 20060101 B30B015/16 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 6, 2014 |
DE |
10 2014 008 613.5 |
Claims
1. A radial press comprising: a frame structure; a pressing tool; a
drive unit; and a press control, wherein the pressing tool
comprises a plurality of pressing elements (2) having pressing
surfaces (8), which elements are disposed uniformly concentrically
around a press axis, and can be moved synchronously, optionally in
the direction toward the press axis (A) or away from it, with
corresponding activation of the drive unit, wherein at least two
measured value recorders (12), connected with a comparator that is
associated with the press control, for transmitting signals, are
disposed on the pressing tool at positions that are spaced apart
from one another in the direction of the press axis (A), wherein
activation of a signal output unit is triggered if a tolerance
range stored in the memory of the press control is exceeded by the
comparison value generated in the comparator, of the measured
values made available by the measured value recorders (12).
2. The radial press of claim 1, wherein if the tolerance range is
exceeded by the comparison value of the signals made available by
the measured value recorders (12), the press control automatically
acts on the drive unit.
3. The radial press of claim 1, wherein three measured value
recorders (12) that are spaced apart from one another in the
direction of the press axis (A) are provided.
4. The radial press of claim 1, wherein the pressing elements (2)
each comprise base jaws (6) and removable pressing jaws (9) that
have the pressing surfaces (8).
5. The radial press of claim 4, wherein removable intermediate jaws
(7) are disposed, in each instance, between the base jaws (6) and
the pressing jaws (9).
6. The radial press of claim 4, wherein measured value recorders
(12) are disposed on at least one base jaw (6), in the region of
its two ends that lie opposite one another in the direction of the
press axis (A).
7. The radial press of claim 6, wherein the measured value
recorders (12) are disposed on the face surfaces (10, 11) of at
least one base jaw (6).
8. The radial press of claim 4, wherein the measured value
recorders (12) are disposed on a base jaw (6.1) that is fixed in
place.
9. The radial press of claim 4, wherein measured value recorders
(12) are disposed on at least one pressing jaw (9), in the region
of its two ends that lie opposite one another in the direction of
the press axis (A), which recorders communicate wirelessly with the
press control so as to transmit signals.
10. The radial press of claim 1, wherein the measured value
recorders (12) are structured as deformation recorders,
particularly as full-bridge strain gauges (13).
11. The radial press of claim 1, wherein the signal output unit
comprises a comparison value display.
12. The radial press of claim 1, wherein the tolerance range can be
set by means of an input unit.
13. The radial press of claim 1, wherein the press control
comprises an adaptation circuit for the tolerance range, which
circuit takes the geometrical location of the pressing surfaces (8)
relative to the position of the measured value recorders (12) into
consideration as the input signal.
14. The radial press of claim 1, further comprising multiple
recorder arrangements disposed distributed around press axis (A),
each having at least two measured value recorders (12), wherein
formation of an average value takes place in the press control.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation under 35 U.S.C. .sctn.120
of International Application PCT/EP2015/000828, filed Apr. 21,
2015, which claims priority to German Application 10 2014 008
613.5, filed Jun. 6, 2014, the contents of each of which are
incorporated by reference herein.
FIELD OF THE INVENTION
[0002] The present invention relates to a radial press having a
frame structure, a pressing tool, a drive unit, and a press
control, wherein the pressing tool comprises a plurality of
pressing elements having pressing surfaces, which elements are
disposed uniformly concentrically around a press axis, and can be
moved synchronously, optionally in the direction toward the press
axis or away from it, with corresponding activation of the drive
unit.
BACKGROUND
[0003] Radial presses of the type indicated above can be used for
various applications, for example for connecting fittings with
house sections, within the scope of the production of hydraulic
hose lines ready for installation. They are known in different
designs and embodiments, for example as what is called a "yoke
press" (cf. DE 4135465 A1, DE 19912976 A1, and DE 19817882 B4, for
example), a "hollow-piston press" (cf. DE 10149924 A1, for
example), or in another design (cf. DE 2844475 A1, DE 3611253 A1,
DE 10047025 C2, and DE 3331721 A1, for example).
[0004] Radial presses of the stated type have proven themselves in
practice. When used properly, connections between two components
can be produced, for example, which have a long useful lifetime and
meet very great demands (e.g. hose section and connection fitting).
Regardless of this, the present device is based on the task of
further improving radial presses of the type stated initially, with
regard to their handling, specifically and particularly to the
effect that high-quality results are dependent, even less than
before, on the experience and/or extensive training of the
respective operator, or, in other words, the risk of the production
of low-quality results by less experienced or less well-trained
operating personnel is reduced.
SUMMARY
[0005] This stated task is accomplished, according to the present
device, in that in a radial press of the stated type, at least two
measured value recorders, connected with a comparator that is
associated with the press control, for transmitting signals, are
disposed on the pressing tool at positions that are spaced apart
from one another in the direction of the press axis, wherein
activation of a signal output unit is triggered if a tolerance
range stored in the memory of the press control is exceeded by the
comparison value generated in the comparator, of the measured
values made available by the measured value recorders. In other
words, the radial press described is therefore characterized in
that at least two measured value recorders are provided on its
pressing tool, specifically in an arrangement in which they are
offset from one another, in the direction of the press axis. These
two measured value recorders are connected with the press control
so as to transmit signals, specifically with a comparator
associated with the control, in which comparator the measured
values or, if applicable, measured value progressions made
available by the two measured value comparators while pressing is
carried out, or at least at its end, are (continuously or
intermittently) compared. If the comparison value determined in
this regard, which--as a function of the specific embodiment of the
recorders--can consist, for example, of the difference of the
measured values made available by the recorders or, alternatively,
their relationship with one another, outside of a tolerance range
that is stored in the memory of the press control, then a signal is
output that signals to the operator that a result lies outside of
the target range or that pressing is taking place outside of the
plan. In this manner, different errors brought about on the
operator side, in particular, which can cause pressing to take
place at lower quality, can be recognized at an early point in
time, and a correction can be made. This specifically holds true
for incorrect positioning of the workpieces within the radial
press, i.e. offset from the ideal position to a greater or lesser
degree, in the direction of the press axis. In this way,
embodiments of the present invention makes use of the recognition
that even an offset of the workpiece that appears to be rather
slight--in the direction of the press axis--relative to its ideal
position leads to internal (asymmetrical or off-center) force
conditions that cause a deformation of the radial press that brings
with it a result of pressing that deviates from its planned form,
for example in that the work piece is slightly conical instead of
cylindrical at the end of pressing. Such a situation cannot be
detected with conventional press controls, even if the pressing
force is monitored during the pressing cycle, because the pressing
force as such typically ranges within the predetermined bandwidth
in this regard, but is introduced into the workpiece to a different
degree over its axial expanse, because the deformation of the
radial press caused by the said offset leads to a--more or less
marked--slanted position of the pressing surfaces relative to the
press axis.
[0006] When using the radial press provided, the ratio of the
measured values made available by the two measured value recorders
is shifted outside of the tolerance range stored in the memory of
the press control in the case of such positioning of the workpiece
within the radial press, deviating from the ideal position. This is
signaled to the operator, if applicable with simultaneous automatic
stopping of the pressing process. If, in this regard, such
detection takes place not only or not just toward the end of the
pressing process, but rather (continuously or at least
intermittently) over the entire pressing process, then the latter
can be stopped at such an early point in time that correction of
pressing is possible, i.e. no scrap is caused in the first place.
Even more, grossly incorrect operation or significant interference
influences, for example the presence of foreign bodies in the
region of the workpiece, processing of damaged (e.g. broken)
workpieces or the like, can be detected immediately when using the
device described, with workpiece breakage that occurs during the
pressing process having the effect of marked inconstancy of the
measured values made available by the measured value recorders, for
example. Detection of incorrect operation is also highly
advantageous with regard to the useful lifetime of the radial
press, for example in that the pressing process is stopped
immediately if there are indications, due to a corresponding
comparison value, that a connection fitting to be connected with a
hose was placed into the radial press all the way to the union nut
or that there is a foreign body in the tool.
[0007] Even if less experienced or less well-trained personnel is
used for operating the radial press, the risk of producing
lower-quality workpieces with the radial pressing process is far
less when using a radial press provided than when using known
radial presses of the stated type, according to the state of the
art.
[0008] The measured values made available by the measuring
recorders can preferably also be used for individual,
workpiece-related modification of the pressing progression stored
in the memory of the press control. In this sense, it is possible,
for example, to modify the pressing speed as a function of the
measured values of the measuring recorders, and, in this manner, to
optimize them specifically with regard to the individual workpiece
to be pressed. Variations with regard to the dimensions and/or the
material of the workpiece that lie within tolerance can be taken
into consideration when carrying out the individual pressing
process, in this way.
[0009] Furthermore, when using the radial press provided, a degree
of effectiveness analysis is possible by way of a comparison of the
forces that bring about forming of the workpiece, for which the
measured values made available by the measured value recorders are
an indicator--if the measured value recorders are suitably
designed--with the energy consumption of the radial press. This,
too, is a measure that allows optimization of the pressing
process--with regard to its energy efficiency.
[0010] A further positive effect of the present invention is the
possibility of saving material in the production of the workpiece
(at the same performance capacity). This is because the workpiece
requires less of a safety margin as the result of optimization of
forming of the workpiece in the radial press provided (see above)
than is required when processing corresponding workpieces on
conventional radial presses--for example in order to guarantee a
secure and reliable connection of a connection fitting with a hose
piece.
[0011] The positive effects of the present invention are not,
however, restricted to the quality of the pressed workpiece.
Instead, monitoring and analysis or evaluation of the measured
values made available by the measured value recorders allow drawing
conclusions regarding the state of the radial press, particularly
regarding wear of wear parts. This makes it possible to better
coordinate the maintenance intervals and the replacement of wear
parts with the individual requirements of the individual machine.
In this case, precautionary early replacement of wear parts is not
necessary, and this is a significant economic aspect. At the same
time, reliability can also be increased; this is because by means
of monitoring and analysis or evaluation of the measured values
made available by the measured value recorders, it is also possible
to immediately recognize damage (for example breakage of pressing
elements or other parts of the pressing tool)--by way of the
anomalies of the measurement values caused by it--which damage
might cause consequential damage, possibly even with danger for the
operating personnel. The same holds true for the recognition of
fatigue of machine components, as well as possible manipulation of
the radial press. In this regard, the measured values determined
are preferably stored in memory for an extended period of time,
archived (if applicable, compressed), and evaluated for the purpose
of optimization of the processes and of quality assurance, and
transmission (online or on data media) to the machine
manufacturer--for a statistical evaluation relating to multiple
radial presses--is also possible.
[0012] Furthermore, if the at least two measured value recorders
are structured appropriately, the measured values made available by
them can be used for a significantly more precise determination of
the pressing force as compared with the presence of merely one
pressing force sensor.
[0013] Particularly informational findings regarding the state of
the radial press and of the pressed workpiece can be obtained if
the measured values made available by the measured value recorders
are put into relation with the process parameters that are
characteristic for the pressing process, such as, for example, the
pressure in a hydraulic cylinder that belongs to the drive unit,
the time within a pressing cycle and/or the path of the drive for
the pressing tool. Not only is it possible to determine irregular
operating states, such as pressing of an incorrect workpiece, use
of a wrong pressing tool, the absence of individual pressing
elements or the like, to be determined by means of reconciliation
of the determined values with reference values that are
characteristic for the pressing process to be carried out. Even in
the case of regular pressing sequences, evaluations are useful, for
example in that the ideal duration of stopping the press at the end
of the pressing process is determined as a function of how the
measured values made available by the measured value recorders
change over time. In this way it is possible, in the interests of
great efficiency, i.e. the shortest possible cycle times, to
shorten holding times that have been dimensioned to be long, as a
precaution. In this sense, the radial press can be opened as soon
as the change in the measured values over time (measured value
gradient) drops below a specific value.
[0014] The progression of the measured values when opening the
radial press in turn provides a direct conclusion regarding the
spring-back of the workpiece. In this way, it can already be
determined at an early point in time, i.e. when the radial press
has not yet been opened completely, that specific follow-up
pressing is still required, so that the workpiece (which springs
back) will adhere to its planned dimension after the radial press
is opened. Comparable conclusions regarding later spring-back of
the workpiece can be drawn from those measured values that the at
least two measured value recorders determined when the planned
dimension of the workpiece is reached for the first time, so that
the dimension of required over-pressing can already be determined,
taking these measured values into account.
[0015] In the above text, it has already been mentioned that in
addition to the (particularly optical and/or acoustical) signal
output unit, by means of which the operator's attention is drawn to
the fact that pressing is not proceeding according to plan, it can
be provided that--by means of influencing the drive unit
accordingly--the pressing process is automatically interrupted or
stopped. It is advantageous, in this regard, if the signal output
unit has a comparison value display and/or a correction value
display, which allows the operator to determine the extent of
possible incorrect positioning of the workpiece or of the
correction required accordingly. The value for a position
correction of the workpiece can be calculated in the press control
itself, from the deviation of the comparison value of the two
measured values made available by the measured value recorders,
from the ideal value for a position correction of the workpiece
stored in the memory of the press control for the pressing process
in question, and, for example, a stop for the workpiece can be
displaced accordingly. The same holds true for optical display of a
corrected position of the workpiece, for example by means of a
laser marking.
[0016] According to another preferred further embodiment, it is
provided that three recorders disposed at a distance from one
another in the direction of the press axis are provided. In this
regard, the third measured value recorder can particularly make a
reference value available, for which purpose it is ideally disposed
more or less centered between the two other measured value
recorders or in the plane of symmetry--that stands perpendicular on
the press axis--of the radial press. Simultaneously taking the
signals of all three measured value recorders into consideration
makes supplemental data available, from which conclusions can be
drawn, particularly with regard to workpiece-specific anomalies
(for example, damage to the workpiece at certain points).
[0017] The present device can be implemented, with excellent
results, also in those radial presses, which are in widespread use,
the pressing elements of which are structured in multiple parts,
particularly in that they--structured in two parts--have a base jaw
radially on the outside and a removable pressing jaw radially on
the inside, or, alternatively--structured in three parts--comprise
a base, an intermediate jaw, and a removable pressing jaw that has
the pressing surface. Particularly informational findings occur in
this case if the measured value recorders are disposed on at least
one pressing jaw, specifically preferably in the region of its two
ends, which lie opposite one another in the direction of the press
axis. From construction aspects and other practical aspects, on the
other hand, placement of the at least two measured value recorders
on at least one base jaw is particularly advantageous. It is true
that the signal intensity of the signal made available by the
respective measured value recorder is typically lower in this
arrangement of the measured value recorders than in the case of
placement of the measured value recorders on the pressing
jaw--which lies directly against the workpiece--something that
would tend to speak in favor of placement of the recorders on the
latter; on the other hand, the signal is still sufficiently strong,
if the measured value recorders disposed on a base jaw are
structured properly, that reliable evaluation in the sense of the
present device can take place. And the disadvantage of a lower
signal intensity is more than outweighed by marked advantages with
regard to the reproducibility of the measured results and also
handling of the radial press during operation. The latter aspect
includes that when the measured value recorder is placed on at
least one base jaw, replacement of a pressing jaw, as required for
refitting the radial press from one pressing task to another, is
not hindered. Also, when the measured value recorders are placed on
at least one base jaw, noteworthy advantages occur from a cost
aspect; in this case, reliable and cost-advantageous measured value
recorders using wired signal transmission can be used, and it is
not necessary to outfit all the pressing jaw sets kept on hand for
the different pressing tasks with measured value recorders. If, in
contrast, it is desirable in an individual case, due to certain
aspects, to place the measured value recorders on the pressing
jaws, these recorders are particularly preferably set up for
wireless signal transmission, in order to avoid the effort
connected with connecting the measured value recorders with the
press control, which would otherwise be necessary for every
refitting of the radial press.
[0018] In the case of such radial presses (typically "yoke
presses"), in which one of the base jaws is disposed fixed in
place--relative to the frame structure, preferably at least two
measured value recorders are disposed on specifically that base
jaw. This proves to be particularly advantageous with regard to the
simplest possible structure of the radial press provided, with
simultaneously great reliability. In this respect, it is
particularly important, as far as the signal quality is concerned,
that no interference influences exist, as is the case of base jaws
not fixed in place, i.e. support so as to slide on control
surfaces.
[0019] Within the scope of the present disclosure, measured value
recorders having different designs can be used, in order to detect
the stress states discussed above, which lead to results not in
accordance with the plan. Particularly advantageous results can be
achieved at comparatively low costs, using measured value recorders
that are structured as deformation recorders. Here, strain gauges
should be specifically mentioned as particularly preferred
embodiments. Signals that can be excellently evaluated are made
available, in this regard, by full-bridge strain gauges, which can
particularly be affixed to the pressing elements (particularly the
base jaws) on the face side. Instead of indirect determination of
the stress states by way of the deformation caused by them, as
detected by deformation recorders such as strain gauges, however,
the stress states (for example in the at least one base jaw) can
also be detected directly--using corresponding measured value
recorders.
[0020] The sampling rates of the measured value recorders are based
on the workpiece to be pressed. While sampling rates preferably lie
in the range between 5 ms and 10 ms (corresponding to a frequency
between 100 Hz and 200 Hz) for typical applications (for example
pressing of a connection fitting to a hydraulic hose), sampling
rates are preferably lower for sensitive applications of the radial
press provided (for example when pressing of or on ceramic
components such as insulators), for example in the range between 1
ms and 10 ms (corresponding to a frequency between 100 Hz and 1
kHz), or even lower.
[0021] The tolerance range stored in the memory of the press
control, which is used in the evaluation of the measured values
made available by the measured value recorders, can particularly
preferably be adjusted by means of an input unit. This takes into
consideration the circumstance that different relationships of the
measured values made available by the individual measured value
recorders, relative to one another, can prove to be ideal,
advantageous or tolerable for different pressing tasks. In
particular, the relationship that the measured values made
available by the measured value transducers ideally have with one
another depends on what the ideal position of the workpiece is
within the pressing tool.
[0022] Alternatively or additively, the press control can
particularly also comprise an adaptation circuit for the tolerance
range, which takes the geometrical location of the pressing
surfaces relative to the position of the recorders into
consideration as an input signal. In this further embodiment it is
taken into consideration that (in the case of multi-part pressing
elements) the axial length of the pressing jaws--particularly those
for low workpiece diameters--is often substantially less than the
axial length of the base jaws on which the measured value recorders
are ideally affixed on the end side (see above). In this regard,
the pressing jaws are typically not affixed so that they are
positioned centered on the base jaws, but rather in such a manner
that pressing jaws and base jaws end flush on the side facing the
operator. This in turn brings with it the result that the pressing
surfaces typically lie offset with reference to the center of the
base jaws. The greater the offset, the more markedly the measured
values made available by the measured value recorders differ in the
case of an ideal progression of pressing.
[0023] It was possible to determine that already in the case of
using two measured value recorders, particularly assigned to a
single pressing element, very good results (particularly in the
sense of great reproducibility) can be achieved. However, this does
not preclude providing recorder arrangements having at least two
measured value recorders, in each instance, in the interests of
redundancy or of the possibility of additional plausibility checks,
distributed over the circumference (particularly on multiple
pressing elements), where average value formation of the measured
values of those recorders that are disposed on the side of the
radial press that faces the operator, on the one hand, and the
measured values of those recorders that are disposed on the side of
the radial press that faces away from the operator, on the other
hand, can take place in the press control. A comparison of the one
and of the other average value with one another then takes place
within the comparator, in order to determine a possible stress
situation not in accordance with the plan, in the sense of the
explanations provided above.
[0024] The radial press provided can furthermore have a temperature
sensor, in accordance with yet another preferred further
development, the signal of which sensor is passed to the machine
control. In this way, temperature-related influences, such as, for
example, the lubrication behavior of lubricants, which is dependent
on the operating temperature, can be taken into consideration and
compensated. In this sense, multiple temperature-dependent
characteristic fields regarding the ideal comparison value of the
measured values and the permissible tolerance are stored in the
memory of the machine control, preferably for every predetermined
pressing process. In this way, even better workpiece quality can be
achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In the following, the present invention will be explained in
greater detail using a preferred exemplary embodiment, structured
as a yoke press, shown in the drawing, which is based on a design
of the radial press essentially corresponding to DE 4135465 A1 (to
the extent that reference is made to it). In this regard, the
figures show:
[0026] FIG. 1--a detail, in a top view, of the face side of the
pressing tool of the radial press, which faces the operator, with
the equipment according to the invention, and
[0027] FIG. 2--a detail, in a perspective view, of the face side of
the pressing tool of the radial press, which faces away from the
operator.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0028] The radial press on which the present exemplary embodiment
is based corresponds, to a great extent, to the design described
and explained in DE 4135465 A1, as it is furthermore also
widespread in practice. To avoid repetition, reference is therefore
made to the said publication, to its full extent.
[0029] In the detail of the front-side top view of the pressing
tool shown in FIG. 1, the lower yoke 1 (fixed in place), five
pressing elements 2, the springs 3 disposed between the pressing
elements, the two slide panels 4 that are laid into the lower yoke
1, as well as the slide panels 5 affixed to the "45.degree.
pressing elements" can be seen. Differently from what is
illustrated in DE 4135465 A1, according to FIG. 1 the lower
pressing element 2.1, disposed fixed in place relative to the lower
yoke 1, does not touch the lower yoke directly, but rather supports
itself exclusively on the slide panels 4. And furthermore, FIGS. 1
and 2 illustrate the three-part structure of the pressing elements
2, in each instance, composed of a base jaw 6, an intermediate jaw
7 that is removably affixed to the base jaw, and a pressing jaw 9
that has the pressing surface 8 and is removably affixed to the
intermediate jaw, as is typical when using pressing elements having
a great radial expanse for pressing tasks having a comparatively
small diameter. If the radial press is refitted for processing
workpieces having a comparatively large diameter, then pressing
jaws 9 are used that are mounted directly on the base jaws 6, so
that in this case, the pressing elements 2 have two parts.
[0030] FIG. 2 shows a typical situation of the individual parts of
three-part pressing elements 2 relative to one another, as far as
the axial expanse is concerned. Specifically, the intermediate jaw
7 is clearly shorter than the base jaw 6, and the pressing jaw 9 in
turn is clearly shorter than the intermediate jaw 7. In this way,
in a typical application, pressing jaws having a length of 70 mm on
base jaws having a length of 118 mm can be used, for example, where
the pressing jaws 9, the intermediate jaws 7, and the base jaws 6
end almost flush on the side facing the operator (FIG. 1).
[0031] On the lower pressing element 2.1, which is fixed in place,
namely on its base jaw 6.1, measured value recorders in the form of
full-bridge strain gauges 13 and 14 are affixed at the end side, on
the two face sides 10 and 11 that lie opposite one another. These
are connected with the press control, namely with a comparator
assigned to it, by way of signal cables 15 so as to transmit
signals.
* * * * *